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Vintage Test Gear and Workshop Equipment For discussions about vintage test gear and workshop equipment such as coil winders. |
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22nd Oct 2014, 9:44 am | #1 |
Nonode
Join Date: Aug 2010
Location: Resolfen, Wales; and Bristol, England
Posts: 2,588
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Test generator crystal change
I'm using a Heathkit IG-37 stereo FM alignment generator which uses a 5.35MHz crystal oscillator to generate the 10.7MHz IF marker.
I'm hoping that I can simply plug in a 6.25MHz crystal to change the IF marker to 12.5MHz to align Leak Troughline tuners. Is it really as simple as that?
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22nd Oct 2014, 10:26 am | #2 |
Moderator
Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 22,799
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Re: Test generator crystal change
Ha! Guessed it before getting down to the next new post!
You could just use a spare sig gen and inject into the grid pin with the crystal removed. With a good sig gen you can move your marker around and read off where it is. David
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22nd Oct 2014, 1:36 pm | #3 |
Nonode
Join Date: Aug 2010
Location: Resolfen, Wales; and Bristol, England
Posts: 2,588
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Re: Test generator crystal change
Would something like an AVO CT378B be ideal?
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22nd Oct 2014, 8:45 pm | #4 |
Moderator
Join Date: Mar 2012
Location: Fife, Scotland, UK.
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Re: Test generator crystal change
You'll need to get it going and calibrated first
Adding a frequency counter would help. Robert will keep the thing until you collect it. I've just got permission from Mandy I'll leave it with him sometime over the weekend. I'll PM you his contact details so you can arrange a rendez-vous to suit both of you. David
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Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done |
22nd Oct 2014, 8:55 pm | #5 |
Nonode
Join Date: Aug 2010
Location: Resolfen, Wales; and Bristol, England
Posts: 2,588
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Re: Test generator crystal change
A happy man!
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Richard Index: recursive loop: see recursive loop Last edited by mole42uk; 22nd Oct 2014 at 9:01 pm. |
22nd Oct 2014, 11:29 pm | #6 |
Dekatron
Join Date: Apr 2009
Location: Oxfordshire, UK.
Posts: 4,923
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Re: Test generator crystal change
Is that a laboratory grade signal generator
B
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22nd Oct 2014, 11:36 pm | #7 |
Moderator
Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 22,799
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Re: Test generator crystal change
No, it's a general-purpose military 2-250MHz free-running oscillator with good screening and a reasonable attenuator. Built to a reasonable standard. The 2MHz lower end rules out AM broadcast radio fixing uses. It doesn't have a crystal calibrator.
I attached pictures to the post offering it. David
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Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done |